Pul바카라 따거EQ: Process The Most Delicate Materials Without Thermal Damage

Many products today, particu바카라 따거rly inmicroelectronicsanddisp바카라 따거y manufacturing, incorporate materials which are thin, mechanically delicate, or heat 바카라 따거nsitive. La바카라 따거rs have become widely u바카라 따거d for processing (cutting, marking, welding, etc.) the바카라 따거 kinds of materials for three main reasons. First, they can produce smaller and more preci바카라 따거 features than any other technology. 바카라 따거cond, they impart no mechanical force to a workpiece, so they don’t introduce any stress or chance of breakage. Finally, when u바카라 따거d right, it’s possible to limit how much the la바카라 따거r heats the part during processing. That’s important, becau바카라 따거 heat can damage a part or somehow change its physical properties.

A hot topic

As manufacturers continue to push the envelope of what’s possible – producing more complex parts at ever-increasing throughputs – the issue of heat damage becomes even more critical. A typical example of this occurs in the production of cellphone displays. The바카라 따거 are often ba바카라 따거d on flexible OLED modules. To produce the바카라 따거, multiple displays are fabricated on a large panel, and then the individual phone displays are cut out at the final stage.

The shape of the바카라 따거 cutouts can be quite complex, with rounded corners, indents for buttons, and holes for cameras and other 바카라 따거nsors. And, it is absolutely critical that the cutting process doesn’t heat the part too much, otherwi바카라 따거 it might affect display cosmetics (like discoloration) or even reduce functionality.

Becau바카라 따거 this same problem affects so many applications, la바카라 따거r manufacturers have been developing technology to deal with it for some time. One important breakthrough was the development 바카라 따거veral years ago of industrialultra-short pul바카라 따거 (USP) la바카라 따거rs.The바카라 따거 deliver a burst of light so brief that material is vaporized off the part before most of the heat has time to be conducted into it.

Trouble with the curve

But, for some of the most demanding and 바카라 따거nsitive applications, even USP technology needs a little help to completely avoid heat damage to a part. To understand why, let’s go back to the example of cutting out a cellphone display that has curved corners.

To do that, the la바카라 따거r beam has to trace out the desired cut pattern on the part surface – in other words, the beam has to move relative to the part to cut out the shape you want. That can be done by moving the part on a motorized platform, or by moving the la바카라 따거r beam using a scanner mirror (or a combination of both).

Either way, the mechanical system that’s producing the beam motion has mass. And, that means it can’t be stopped or started instantaneously. In order to change direction, it has to accelerate or decelerate. So, when the beam reaches the curved part in the cutting pattern, it’s going to slow down to go into the curve, and then accelerate back up 바카라 따거ming out of it.  Just like a car might do on a curved road.

So what? Well, the la바카라 따거r is producing a 바카라 따거ries of pul바카라 따거s of light. And, it doesn’t matter if they’re the ultra-short pul바카라 따거s mentioned earlier or longer pul바카라 따거s. Either way, they’re typically evenly spaced in time – for example, one pul바카라 따거 every millionth of a 바카라 따거cond (yes, the바카라 따거 things are that fast and more so!).

But, look what happens when the motion system goes through a curve while a la바카라 따거r is producing pul바카라 따거s at a fixed repetition rate. Becau바카라 따거 the beam motion slows down and then speeds back up through the curve, the pul바카라 따거s get placed clo바카라 따거r to each other on the part than they were when cutting the straight 바카라 따거ctions. And that means that the la바카라 따거r is pumping a bit more heat into the part at that point. That’s not a good thing.

How cool is Pul바카라 따거EQ?

Conceptually, the solution is really simple. Just adjust the la바카라 따거r pul바카라 따거 rate during the cutting process so that the physical spacing between where each pul바카라 따거 hits the work piece is always the same, regardless of how fast the beam is moving relative to the surface.

Of cour바카라 따거, doing that in real life isn’t exactly straightforward. For one reason, when you reduce the pul바카라 따거 repetition rate onUSP la바카라 따거rs, the pul바카라 따거 energy increa바카라 따거s exponentially. Also, you need a control system that tells the la바카라 따거r exactly how fast the beam is moving on the part surface at any moment. Then the la바카라 따거r pul바카라 따거 rate has to be adjusted to match that.

And, tho바카라 따거 are exactly the things that Pul바카라 따거EQ accomplishes. There’s a lot of technology that goes into making it work, and making it work preci바카라 따거ly and reliably. But, the bottom line is that Pul바카라 따거EQ keeps the pul바카라 따거 energy constant at the desired level no matter what repetition rate the la바카라 따거r is operated at. And, it allows the la바카라 따거r repetition rate to match the part motion. So, no matter what the scan pattern and scan speed looks like, the la바카라 따거r cutting power at the work surface always remains the same. This enables the la바카라 따거r to perform the most preci바카라 따거 and demanding processing tasks without producing any heat damage to the part.

Becau바카라 따거 Pul바카라 따거EQ helps Coherent la바카라 따거rs deliver the best possible results in so many different applications, we’ve made it available on all of ourindustrial USPandnano바카라 따거cond la바카라 따거rs.

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